email error when sent to multiple recipients.

Hi, I'm receiving an error when a domain is sent an email to multiple recipients, any ideas?

Jun 24 10:02:51 mail postfix/qmgr[2644]: DADAB220070: from=<Sarah.Rowsell@sender.com>, size=992804, nrcpt=2 (queue active)
Jun 24 10:02:51 mail postfix/pipe[22029]: DADAB220070: to=<karl@my-domain.co.uk>, relay=dovecot, delay=92966, delays=92965/0.01/0/0.1, dsn=4.3.5, status=deferred (mail system configuration error)
Jun 24 10:02:51 mail postfix/pipe[22029]: DADAB220070: to=<mark@my-domain.co.uk>, relay=dovecot, delay=92966, delays=92965/0.01/0/0.14, dsn=4.3.5, status=deferred (mail system configuration error)
Jun 24 10:02:51 mail postfix/pipe[22029]: warning: pipe flag `D' requires dovecot_destination_recipient_limit = 1
Jun 24 10:05:23 mail postfix/anvil[3164]: statistics: max connection rate 3/3600s for (smtp:162.xxx.206.201) at Jun 24 10:02:15
Jun 24 10:05:23 mail postfix/anvil[3164]: statistics: max connection count 1 for (smtp:109.xx.65.85) at Jun 24 09:56:17
Jun 24 10:05:23 mail postfix/anvil[3164]: statistics: max message rate 3/3600s for (smtp:162.xxx.206.201) at Jun 24 10:02:15

I had this problem but right now I don't remember how I fixed it
anyway is something in main.cf of postfix

This really should be fixed in CWP if possible.

I rebuild postfix yesterday and ran into the same problem after that.

postconf -e dovecot_destination_recipient_limit=1

and restarting postifx fixed the problem for me too.